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| &nbsp; || <math>s = s_1 \cdot t^{-1}.</math>
 
| &nbsp; || <math>s = s_1 \cdot t^{-1}.</math>
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| 4. || <math>s\!</math> is a ''subclause'' of <math>\mathfrak{L}</math> if and only if
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| &nbsp; || <math>s\!</math> is a sentence of <math>\mathfrak{L}</math> and <math>s\!</math> ends with a <math>^{\backprime\backprime} \, \operatorname{)} \, ^{\prime\prime}.</math>
 
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<pre>
 
<pre>
4.  z is a "subclause" of !L! if and only if
  −
  −
    z is a sentence of !L! and z ends with a ")-".
  −
   
5.  z is the "subcatenation" of z_1 by z_2 if and only if
 
5.  z is the "subcatenation" of z_1 by z_2 if and only if
  
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